dirstate-cext: properly invalidate mtime and data in `set_untracked` This was forgotten about in the initial implementation and was revealed while adding the `dirstate-v2` variant of `test-issue660.t`. Neither the existing Python implementation nor the upcoming Rust implementation suffer from this bug since they respectively have `None` and `Option<T>` to represent the lack of information. Differential Revision: https://phab.mercurial-scm.org/D12414

--- a/mercurial/cext/parsers.c	Tue Mar 22 03:19:01 2022 +0100
+++ b/mercurial/cext/parsers.c	Mon Mar 28 17:24:41 2022 +0200
@@ -517,6 +517,8 @@
 static PyObject *dirstate_item_set_untracked(dirstateItemObject *self)
 {
 	self->flags &= ~dirstate_flag_wc_tracked;
+	self->flags &= ~dirstate_flag_has_meaningful_data;
+	self->flags &= ~dirstate_flag_has_mtime;
 	self->mode = 0;
 	self->size = 0;
 	self->mtime_s = 0;